The current situation
The major religion remains Roman Catholic. According to the results of the latest Census in 2011, 81% of Portuguese people are Catholic, 3,6% from other religions and 6,8% have no religion.
For further information, see the article "Religions and Secularism in Portugal: mainly a lingering monotheism" (September 2015) by H. Machado Jorge on O-Re-La website.